Checkpoints And Measures If A Breakdown Occurs - Noritz WHiC56 Service Manual

Checkpoints and Measures if a Breakdown Occurs

■ Error Codes and Checkpoints
Display*
(F) 10 Combustion abnormality
(Output drop)
(Warning indication)
(F) 11 Ignition failure
(Initial flame fault detection)
(F) 12 Flame Rod does not detect flame
(Flame fault detection)
(F) 13 CO Alarm operation
(CO Alarm connected only)
(F) 14 Overheat Prevention Device
(Thermal Fuse) triggered
Abnormally high output
(F) 16
temperature
(F) 20 High Limit Switch triggered
(F) 29 Condensate Container clogging
< Condensing Model only >
(F) 30 Air Inlet Thermistor abnormality
(F) 31 Water Inlet Thermistor abnormality
(F) 32 Water Outlet Thermistor
abnormality
(F) 33 Heat Exchanger Thermistor
abnormality
(F) 35 Exhaust Thermistor abnormality
< (L)WHiC56 only >
(F) 51 Failure of Gas Solenoid Valve
(other than drive circuit)
(F) 61 Fan Motor abnormality
(F) 65 Main Flow Control Valve
abnormality
(F) 66 Bypass Flow Control Valve
abnormality
(F) 70 Circuit Board abnormality
(F) 71 Gas Solenoid Valve drive circuit
abnormality
(F) 72 Flame Rod circuit abnormality
(Detection of flame when no
flame is present)
(F) 73 Circuit Board setting abnormality
(Improper Maintenance Writers
Settings, DIP Switch Settings, etc.)
F76 Multi-system communication
error
760 Remote Controller transmission
abnormality
(F) 90 Combustion abnormality
(Warning indication)
Combustion abnormality
(Unit shuts off)
(F) 94 Exhaust temperature is too high
< (L)WHiC56 only >
(F) 99 Combustion abnormality
(Unit shuts off)
*In a Quick Connect Multi-System, "F##"(except F76) indicates an error code from the secondary unit (unit without a remote controller).
*(L)WHi49 series flue system type is Room sealed
(less than 2 meters) without elbow, the DIP switch should be changed. Refer to DIP switch table No.7 and No.8. Select result "C long
length".
Description
Check for abnormal combustion.
Check flue for blockage or obstruction.
Check the gas supply piping and pressure. Check for Igniter
spark ( 13 ). Check Gas Solenoid Valves and Gas Proportioning
Valve ( 14, 15, 16, 17 ).
Check Flame Rod ( 10 ). Check earth, paying special attention
to the earth connection to the Circuit Board.
Check for accidental extinction of the flame. Check for abnormal
combustion. Check Gas Solenoid Valves. Check Flame Rod ( 10 ).
Check earth, especially on Circuit Board.
Check for exhaust leakage.
Check for CO Alarm failure.
Check for melting or damage to the Thermal Fuse ( 1 ).
Check for improper connection of Thermal Fuse.
Measure the resistance through the Water Outlet Thermistor ( 6 ).
Check for Gas Proportioning Valve ( 17 ).
Check for Burner Gas Pressure.
Check if High Limit Switch is triggered ( 20 ).
Check for improper connection of High Limit Switch.
Check if the drain line is clogged or frozen ( 22, 23 ).
Check that the drain pipe slope down.
Measure the resistance through the Air Inlet Thermistor ( 21 ).
Check for an open or short circuit.
Check for improper connection of Air Inlet Thermistor.
Measure the resistance through the Water Inlet Thermistor ( 5 ).
Check for an open or short circuit.
Check for improper connection of Water Inlet Thermistor.
Measure the resistance through the Water Outlet Thermistor ( 6 ).
Check for an open or short circuit.
Check for improper connection of Water Outlet Thermistor.
Measure the resistance through the Heat Exchanger Thermistor
( 7 ). Check for an open or short circuit.
Check for improper connection of Heat Exchanger Thermistor.
Measure the resistance through the Exhaust Thermistor ( 8 ).
Check for an open or short circuit.
Check for improper connection of Exhaust Thermistor.
Check for proper connection of the Gas Solenoid Valves.
Check for damage to the Gas Solenoid Valve connections.
Check that the fan is rotating and check the pulse frequency from
the fan rotational frequency sensor ( 11,12 ). Check for improper
connection of the fan. Check voltage from Circuit Board.
Check that the Main Flow Control Valve is functioning ( 2 ).
Check for improper connection of the valve.
Check that the Bypass Flow Control Valve is functioning ( 3 ).
Check for improper connection of the valve.
Circuit Board failure.
Check for damage to the Gas Solenoid Valve drive circuit on the
Circuit Board.
Measure the current from the Flame Rod when there is no flame
( 9 ).
Check for a earth fault.
Check for proper setting of maintenance writers on Circuit Board.
Check the Circuit Board (microcomputer) for damage.
Check the DIP switch settings.
(Ex. vent length, etc.).
Check for proper connection of Quick Connect Cord.
Check connection from Remote Controller to Circuit Board.
Check Remote Controller and Circuit Board for damage.
Check for abnormal combustion.
Check flue and air inlet for blockage or obstruction.
Check for abnormal combustion. Check flue for blockage or
obstruction. Check that flame ignites all across the burner.
Check for abnormal combustion ( 8 ).
Check for abnormal combustion.
Check flue for blockage or obstruction.
If the heater exhibits noise and vibration when installed with flue terminal and flue
Diagnosis Point (Trouble Point)
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